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19 February, 19:48

Which of the following is a solution of x^2 + 2x + 8?

4 + i times the square root of 7

-1 + i times the square root of 7

2 + i times the square root of 7

-4 + i times the square root of 7

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Answers (1)
  1. 19 February, 20:17
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    X^2 + 2x + 8 = 0

    x^2 + 2x = - 8

    x^2 + 2x + 1 = - 8 + 1

    (x + 1) ^2 = - 7

    x + 1 = (+-) sqrt - 7

    x = - 1 (+-) sqrt - 7

    solution is : x = - 1 + i * sqrt 7
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